thanks old-polack
it worked.
just for that i reinstalled twice before this.
now it works fine. 
You're welcome.

Just remember, if you do install another kernel,
before rebooting to use it, you will have to
check the
On Boot box for
dkms, again. After your reboot into that kernel, all your dkms drivers will be rebuilt during the boot process, and once you reach the desktop, you can then, once more,
uncheck the dkms
On Boot box.